\begin{abstract} 



Vehicular networks or mobile devices can be seen as network nodes that can
communicate using Internet Protocol. More over security in management and
inter-communication of fleet of vehicles or mobile devices are likely to become
the most relevant recent years. In this paper, we address the security of these
networks. We provide a detailed threat analysis and propose appropriate
security architecture based in Public Key Infrastructure (PKI). We also
describe some major design decisions still to be made, which in some cases have
more than mere technical implications.

\end{abstract}


